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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Keyhole electron diffractive imaging (KEDI).

Liberato De Caro1, Elvio Carlino, Fabio Alessio Vittoria

  • 1Istituto di Cristallografia-Consiglio Nazionale delle Ricerche (IC-CNR), Bari, Italy. liberato.decaro@ic.cnr.it

Acta Crystallographica. Section A, Foundations of Crystallography
|October 19, 2012
PubMed
Summary

Keyhole electron diffractive imaging (KEDI) enables sub-ångström resolution imaging of nano-regions in extended crystalline specimens. This advanced technique overcomes previous limitations by retrieving phase information from diffraction patterns.

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Area of Science:

  • Materials Science
  • Crystallography
  • Electron Microscopy

Background:

  • Electron diffractive imaging (EDI) combines transmission electron microscopy images with nano-electron diffraction patterns.
  • Phase retrieval algorithms are crucial for reconstructing the specimen's atomic potential.
  • Current EDI methods are limited to isolated nanoparticles.

Purpose of the Study:

  • To generalize electron diffractive imaging for studying extended crystalline specimens.
  • To introduce a new technique, keyhole electron diffractive imaging (KEDI), for high-resolution analysis of nano-regions.
  • To address phase retrieval challenges in KEDI.

Main Methods:

  • Generalization of electron diffractive imaging to extended specimens.
  • Development and application of keyhole electron diffractive imaging (KEDI).
  • Utilizing the generalized Shannon sampling theorem for phase information retrieval.
  • Simulations and experimental validation on silicon crystal cross-sections.

Main Results:

  • Demonstrated KEDI for studying nano-regions of extended crystalline specimens.
  • Achieved sub-ångström resolution (71 pm) in experimental validation.
  • Confirmed that KEDI diffraction patterns contain sufficient information for reliable phase retrieval under oversampling conditions.

Conclusions:

  • KEDI successfully extends electron diffractive imaging capabilities to extended crystalline materials.
  • The method allows for atomic-scale visualization of nano-regions within bulk materials.
  • KEDI offers a powerful new tool for materials characterization at unprecedented resolution.